Add GitHub MCP Server setup instructions

[jacobsoto01121997]

Added installation instructions for GitHub MCP Server in Cursor, including prerequisites, setup steps, and troubleshooting tips.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace

Error

 ⚠️ OCA signatory status must be verified

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/guide.git pull/161/head:pull/161
$ git checkout pull/161

Update a local copy of the PR:
$ git checkout pull/161
$ git pull https://git.openjdk.org/guide.git pull/161/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 161

View PR using the GUI difftool:
$ git pr show -t 161

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/guide/pull/161.diff

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[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[jacobsoto01121997]

Okay,

[JesperIRL]

Who are the intended users here?